Improved "mtk -l" output on narrow terminals
added note about requiring upper case for pitch classes
released gem version 0.4
minor updates to README / dev notes
whoops, removed junk from Rakefile
starting to reorganize groups module, stubbed out a scale class
changed MTK::Groups::Group from a module to a class
renamed Melody to PitchGroup
Split PitchClassSet into PitchClassGroup and PitchClassSet. Fleshed out Scale.